Question about Polaris ATV

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Backfires at half to full throttle, idle is ok, low rpm

98 sportsman 500, 4 stroke

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Posted on May 24, 2009

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Change Your spark plugs. If that doesn't help the carburetor needs to be cleaned and checked. Hope that helps.

Posted on May 24, 2009

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1 Answer

I have a 1998 Polaris Sportsman 500 ATV that won,t idle and backfires. Chuggs when idiling, Starts hard, even with choke. Hitting the throttle makes it die out


Could be a vacuum leak in the intake tract. Try spraying carb cleaner with the straw that come with can around the intake and carb area. If there is a leak, engine speed well change.
I

Oct 28, 2017 | ATVs

1 Answer

1995 [POLARIS 400 SPORTSMAN. carb has been cleaned AND REBUILT. STARTS AND RUNS GOOD LOW SPEEDS. DRIVES UP TO ABOUT HAlf throttle and cuts out. will restart and run the same again


if thats the 2 stroke (pretty sure it is) you have to watch the crank seals on those. cause running probs and eventually destroy the motor.

Mar 12, 2017 | ATVs

2 Answers

Starts and idles fine runs half throttle when fuel is applied


Harry, dirty carb or injectors.
Check the attached links,Manuals and guides, Good luck with your Bike
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

ATV TROUBLESHOOTING AND MAINTENANCE
ATV Service and Repair Manuals
http://www.carlsalter.com/motorcycle-manuals.asp

Jan 06, 2016 | ATVs

1 Answer

Why does my 1999 Polarish Sportsman 500 idle ok but backfires and loses power with RPM's?


sounds like an air leak, prob between the carb and air filter. when you open it up the carb loses vacuum and cant draw fuel.

Jul 08, 2014 | ATVs

1 Answer

Engine won't idle /sometimes backfires


Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve

Mar 24, 2014 | Polaris 2006 Sportsman 450

1 Answer

How to turn up idle on 2013 polaris sportsman 500 ho


follow ur throttle cable down to cars there should be a plastic screw close to cable to adjust idea but with polaris that screw can be hard to find with all the plasticc they put in way but if u can see carbs easy enough u will see the idle screw

Feb 11, 2014 | Polaris 2013 Sportsman 500 HO

1 Answer

Idles great but open the throttle it misses and backfires


sounds like you have an air leak on the intake somewhere

Jul 12, 2017 | Polaris ATV

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